Needle bar clutch reset device of double-needle sewing machine

Abstract

The utility model belongs to the technical field of sewing machines. The problem that in the prior art, a single-needle and double-needle switching mechanism is poor in use reliability is solved. The needle bar clutch reset device of the double-needle sewing machine comprises a supporting frame and a locking and unlocking device, needle bars are arranged on the supporting frame in a penetrating mode, the locking and unlocking device is arranged on the supporting frame and used for locking or unlocking the needle bars, and clutch assemblies are arranged on the two needle bars in a sleeving mode at the same time. The clutch assembly comprises a clutch base, two unlocking levers arranged on the clutch base and used for unlocking the needle bars respectively and a locking rod used for locking the two needle bars at the same time, the main shaft is sleeved with an eccentric wheel, the eccentric wheel is connected with the clutch base through a swing rod, and the supporting frame is fixedly connected with a double-stroke air cylinder; an output shaft of the double-stroke air cylinder is horizontally arranged and connected with a trigger rod, the trigger push rod is provided with a protruding part arranged upwards, the protruding part is located below the unlocking lever and the locking rod, and the protruding part, the unlocking lever and the locking rod are located on the same vertical plane. The needle bar clutch reset device has the advantage that the use reliability of the needle bar clutch reset device can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a needle bar clutch and reset device for a double-needle sewing machine. Background Technology

[0002] A double-needle sewing machine (abbreviated as double-needle machine) is a sewing machine containing two needles. The stitches it produces are two parallel and mutually parallel threads. Due to the high efficiency of double needles and the neat and beautiful parallel threads, it is widely used in the mass production of clothing. Double-needle machines usually include a needle bar separation component and a needle bar reset component, which are used to separate and reset the double needle bars when sewing at bends.

[0003] For example, Chinese patent literature discloses a single / double needle conversion mechanism for a double-needle sewing machine (application number: 201920065549.7), including a pair of needle bars, a needle bar support frame, and a single / double needle drive device. This device includes a rocker arm, a slider driven by the rocker arm to move up and down, and a clutch assembly. The slider is connected to the clutch assembly and drives the clutch assembly to move up and down. The clutch assembly includes a clutch element, a rotating lever, a locking element, a trigger rod, a bracket, a first return spring, and a second return spring. The middle part of the rotating lever is movably hinged to the bracket. The first return spring is clamped between the upper end of the rotating lever and the bracket. The lower end of the rotating lever is movably hinged to the clutch element. One end of the locking element is movably hinged to the bracket, and the other end is a free end. The second return spring is clamped between the bracket and the locking element. The needle bar support frame is equipped with a needle bar locking device and a clutch triggering device for triggering the disengagement or engagement of the clutch assembly. The clutch triggering device includes a triggering drive assembly and a sliding rod that can move left and right. The sliding rod has two triggering positions, left and right, for pressing the left and right rotating levers to rotate respectively. When the sliding rod is in the left triggering position, it presses the upper end of the left rotating lever, thereby triggering the left clutch assembly to disengage from the left needle bar. When the sliding rod is in the right triggering position, it presses the upper end of the right rotating lever, thereby triggering the right clutch assembly to disengage from the right needle bar. The triggering drive assembly includes a cylinder, a first connecting rod, a transition lever, and a second connecting rod. The first connecting rod is movably hinged to the cylinder push rod and the transition lever, and the second connecting rod is movably hinged to the transition lever and the sliding rod respectively.

[0004] The single / double needle conversion mechanism of this double-needle sewing machine has the following shortcomings during use: the clutch triggering device of the single / double needle conversion mechanism of this double-needle sewing machine uses a lot of connecting rods that are hinged together, the structure is complex, the transmission route is long, and the transmission accuracy and stability are poor, which makes the single / double needle conversion mechanism of this double-needle sewing machine unreliable. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a needle bar clutch reset device for a double-needle sewing machine. The technical problem this invention aims to solve is how to improve the reliability of the needle bar clutch reset device.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A needle bar clutch reset device for a double-needle sewing machine, the double-needle sewing machine including a main shaft and two needle bars, the needle bar clutch reset device including a support frame through which the needle bars pass and a locking / unlocking device disposed on the support frame for locking or unlocking the needle bars, a clutch assembly simultaneously sleeved on both needle bars, the clutch assembly including a clutch seat and two unlocking levers disposed on the clutch seat for unlocking the needle bars respectively and a locking lever for locking both needle bars simultaneously, characterized in that an eccentric wheel is sleeved on the main shaft, the eccentric wheel is connected to the clutch seat through a rocker arm, a double-stroke cylinder is fixedly connected to the support frame, the output shaft of the double-stroke cylinder is horizontally arranged and connected to a trigger rod, the trigger push rod has an upwardly oriented protrusion, the protrusion is located below the unlocking levers and the locking lever, and the protrusion, the unlocking lever and the locking lever are located on the same vertical plane.

[0008] Unlike existing technologies, the clutch assembly of the needle bar clutch reset device in this double-needle sewing machine is connected to the main shaft via a swing arm and an eccentric wheel. The main shaft of the double-needle sewing machine drives the clutch assembly to move vertically up and down. Simultaneously, by setting a double-stroke cylinder on the support frame, the double-stroke cylinder can drive the trigger push rod to move horizontally under the control of the solenoid valve and stop at three positions. This allows the protrusion of the trigger push rod to collide with the locking rod and the two unlocking levers located on the same vertical plane, thereby locking the clutch assembly with one or both needle bars. This greatly simplifies the structure of the needle bar clutch reset device, significantly reduces the use of connecting rods, and adopts a direct drive method, making the transmission simpler and more reliable, thus improving the reliability of the needle bar clutch reset device.

[0009] In the needle bar clutch reset device of the aforementioned double-needle sewing machine, the support frame has a stepped portion and a fixed cover plate. A movable guide groove is formed between the cover plate and the stepped portion. The trigger push rod is located within the movable guide groove and abuts against the stepped portion. This makes the horizontal movement position of the trigger push rod more precise.

[0010] In the needle bar clutch reset device of the aforementioned double-needle sewing machine, the end of the trigger push rod has a U-shaped portion, and an L-shaped connecting block is connected to the output shaft of the double-stroke cylinder. The connecting block has a connecting hole, and the U-shaped portion of the trigger push rod passes through the connecting hole and engages with the connecting block. This makes the connection between the trigger push rod and the double-stroke cylinder more stable and facilitates disassembly and assembly.

[0011] In the aforementioned needle bar clutch reset device for a double-needle sewing machine, the side of the clutch seat has a long strip-shaped connecting part, and the upper end of the rocker arm is sleeved on the connecting part. This makes the assembly and disassembly of the rocker arm and the clutch seat more convenient.

[0012] In the needle bar clutch reset device of the aforementioned double-needle sewing machine, a solenoid valve is also fixed on the support frame, and the solenoid valve is connected to the double-stroke cylinder. The solenoid valve is used to control the air intake and exhaust of the double-stroke cylinder, so that the double-stroke cylinder can better drive the trigger push rod to sequentially achieve stopping and reset at three positions under the control of the solenoid valve.

[0013] Compared with existing technologies, the advantages of the needle bar clutch reset device of this double-needle sewing machine are as follows: The clutch assembly of the needle bar clutch reset device of this double-needle sewing machine is connected to the main shaft through a swing arm and an eccentric wheel, and the main shaft of the double-needle sewing machine drives the clutch assembly to move vertically up and down. At the same time, by setting a double-stroke cylinder on the support frame and a trigger push rod driven by the double-stroke cylinder to move horizontally and stop at three positions, the protrusion of the trigger push rod can collide with the locking rod and the two unlocking levers located on the same vertical plane, thereby locking the clutch assembly with one or two needle bars. This greatly simplifies the structure of the needle bar clutch reset device, significantly reduces the use of connecting rods, and adopts a direct drive method, making the transmission simpler and more reliable, thereby improving the reliability of the needle bar clutch reset device. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the needle bar clutch reset device of this double-needle sewing machine.

[0015] Figure 2 This is an exploded view of the double-stroke cylinder, connecting block, and trigger push rod of the needle bar clutch reset device of this double-needle sewing machine.

[0016] Figure 3 This is a schematic diagram of the needle bar clutch reset device (after removing the main shaft, eccentric wheel, and swing arm, etc.) of this double-needle sewing machine when the needle bar near the double-stroke cylinder is unlocked from the clutch assembly.

[0017] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0018] Figure 5 This is a schematic diagram of the needle bar clutch reset device (after removing the main shaft, eccentric wheel, and swing arm, etc.) of this double-needle sewing machine when both needle bars are simultaneously unlocked from the clutch assembly.

[0019] Figure 6 yes Figure 5 A magnified view of a section at point B in the middle.

[0020] Figure 7 This is a schematic diagram of the needle bar clutch reset device (after removing the main shaft, eccentric wheel, and swing arm, etc.) of this double-needle sewing machine when the needle bar is unlocked from the clutch assembly away from the double-stroke cylinder.

[0021] Figure 8 yes Figure 7 A magnified view of a section at point C.

[0022] Figure 9 This is an exploded view of the needle bar clutch reset device of this double-needle sewing machine (after removing the double-stroke cylinder, solenoid valve, main shaft, eccentric wheel, and swing arm).

[0023] Figure 10 This is a schematic diagram of the structure of the needle bar clutch reset device locking component of this double-needle sewing machine, which is embedded in the lower limit groove.

[0024] Figure 11 This is a schematic diagram of the needle bar clutch reset device of this double-needle sewing machine, in which the clutch component is embedded in the lower limit groove.

[0025] In the diagram, 1. Main shaft; 2. Needle bar; 2a. Needle bar groove; 2a1. Upper limit groove; 2a2. Lower limit groove; 3. Support frame; 3a. Stepped part; 3b. Mounting hole; 3c. Mounting plate; 4. Clutch assembly; 4a. Clutch seat; 4a1. Connecting part; 4b. Unlocking lever; 4c. Locking rod; 4d. Clutch element; 4e. Touch spring; 4f. First return spring; 4g. Snap-fit ​​element; 4h. Second return spring; 5. Eccentric wheel; 6. Rocker arm; 7. Double stroke cylinder; 7a. Output shaft; 8. Trigger push rod; 8a. Protrusion; 8b. U-shaped part; 9. Cover plate; 10. Moving guide groove; 11. Connecting block; 11a. Connecting hole; 12. Solenoid valve; 13. Locking and unlocking device; 13a. Seesaw; 13b. Locking element; 13c. Locking spring. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] A needle bar clutch reset device for a double-needle sewing machine, as described in the following figure. Figure 1-11The double-needle sewing machine includes a main shaft 1 and two needle bars 2. The needle bar clutch and reset device includes a support frame 3 through which the needle bars 2 pass, and a locking / unlocking device 13 mounted on the support frame 3 for locking or unlocking the needle bars 2. Clutch components 4 are simultaneously fitted onto both needle bars 2. The clutch component 4 includes a clutch seat 4a, two unlocking levers 4b respectively for unlocking the needle bars 2, and a locking lever 4c for simultaneously locking both needle bars 2, mounted on the clutch seat 4a. An eccentric wheel 5 is fitted onto the main shaft 1. Wheel 5 is connected to clutch seat 4a via rocker arm 6. Double-stroke cylinder 7 is fixedly connected to support frame 3. The output shaft 7a of double-stroke cylinder 7 is horizontally arranged and connected to trigger rod. Trigger push rod 8 has an upwardly oriented protrusion 8a. The protrusion 8a is located below unlock lever 4b and locking rod 4c, and the protrusion 8a, unlock lever 4b and locking rod 4c are located on the same vertical plane. Solenoid valve 12 is also fixedly installed on support frame 3. Solenoid valve 12 is connected to double-stroke cylinder 7.

[0028] Specifically, refer to Figure 1-11 The support frame 3 has a stepped portion 3a and a cover plate 9 fixedly mounted thereon. A movable guide groove 10 is formed between the cover plate 9 and the stepped portion 3a. The trigger push rod 8 is located in the movable guide groove 10 and abuts against the stepped portion 3a. The end of the trigger push rod 8 has a U-shaped portion 8b. An L-shaped connecting block 11 is connected to the output shaft 7a of the double-stroke cylinder 7. The connecting block 11 has a connecting hole 11a. The U-shaped portion 8b of the trigger push rod 8 passes through the connecting hole 11a and is engaged with the connecting block 11. The side of the clutch seat 4a has a long strip-shaped connecting portion 4a1. The upper end of the rocker arm 6 is sleeved on the connecting portion 4a1.

[0029] Structural description of needle bar 2:

[0030] Reference Figure 9 , Figure 10 and Figure 11 Two needle bars 2 are parallel to each other and pass through the support frame 3. Each needle bar 2 moves up and down in the vertical direction. Each needle bar 2 has a needle bar groove 2a opened along its axial direction and an upper limit groove 2a1 and a lower limit groove 2a2 opened along its radial direction. The upper limit groove 2a1 and the lower limit groove 2a2 are located at the upper and lower ends of the needle bar groove 2a, respectively. The seesaw 13a is set in the needle bar groove 2a. The seesaw 13a has a through hole in the middle. A pin passes through the through hole, and the two ends of the pin are fixed to the two side walls of the needle bar groove 2a by riveting.

[0031] The lower limit groove 2a2 is located above the lower end of the seesaw 13a, perpendicularly intersecting the needle bar groove 2a, and its bottom is lower than the innermost position of the lower end of the seesaw 13a when it swings, so that the locking member 13b of the locking and unlocking device 13 can be firmly locked in the lower limit groove 2a2. The upper limit groove 2a1 is located above the upper end of the seesaw 13a, perpendicularly intersecting the needle bar groove 2a, and its bottom is lower than the innermost position of the upper end of the seesaw 13a when it swings.

[0032] The seesaw 13a swings within the needle bar groove 2a, centered on a pin. When the clutch 4d of the clutch assembly 4 engages in the upper limit groove 2a1 under the force of the first return spring 4f, the clutch 4d drives the seesaw 13a to swing, with its upper end swinging inward and its lower end swinging outward. When the lower end swings outward, it pushes the locking member 13b of the locking and unlocking device 13 out of the lower limit groove 2a2, allowing the needle bar 2 to move up and down. Therefore, the maximum distance the lower end of the seesaw 13a swings outward should meet the requirement of pushing out the locking member 13b. In addition, the force of the first return spring 4f acting on the clutch 4d should be greater than the force of the locking spring 13c acting on the locking member 13b, so that the seesaw 13a can push the locking member 13b out of the lower limit groove 2a2.

[0033] The locking / unlocking device 13 is existing technology and can adopt the following structure:

[0034] Reference Figure 9 , Figure 10 and Figure 11 The locking and unlocking device 13 includes a seesaw 13a, a locking member 13b, and a locking spring 13c. The two ends of the locking spring 13c press against the locking member 13b and the support frame 3, respectively. The needle rod 2 is provided with an upper limit groove 2a1 and a lower limit groove 2a2. The upper limit groove 2a1 and the lower limit groove 2a2 are located on both sides of the rotation fulcrum of the seesaw 13a, respectively. Under the action of the locking spring 13c, the locking member 13b can be inserted into the lower limit groove 2a2 to lock the needle rod 2, and it can also be disengaged from the lower limit groove 2a2 by the prying force of the seesaw 13a.

[0035] The support frame 3 has a mounting hole 3b for the locking member 13b to extend into or retract from the lower limit groove 2a2. The mounting hole 3b restricts the movement of the locking member 13b. One end of the locking spring 13c abuts against the locking member 13b, and the other end abuts against the cover plate of the support frame 3 that closes the mounting hole 3b. The locking member 13b has a snap-fit ​​portion that matches the lower limit groove 2a2. When the locking member 13b extends into the lower limit groove 2a2, it locks the needle bar 2 onto the support frame 3, keeping it stationary. At this time, the single / double needle drive mechanism only drives the unlocked needle bar 2 to move up and down. When the seesaw 13a pries the locking member 13b out of the lower limit groove 2a2, the single / double needle drive mechanism drives both needle bars 2 to move up and down simultaneously.

[0036] Clutch assembly 4 is existing technology and can adopt the following structure:

[0037] Reference Figure 9 The clutch assembly 4 includes a clutch seat 4a and a locking lever 4c, a clutch member 4d, a trigger spring 4e, two unlocking levers 4b, two first return springs 4f, two locking members 4g, and two second return springs 4h disposed on the clutch seat 4a. The middle part of the unlocking lever 4b is movably hinged to the clutch seat 4a. The first return spring 4f is sandwiched between the lower end of the unlocking lever 4b and the clutch seat 4a, and the upper end of the unlocking lever 4b is movably hinged to the clutch member 4d. The trigger spring 4e is sandwiched between the clutch seat 4a and the locking lever 4c. One end of the locking member 4g is movably hinged to the clutch seat 4a, and the other end is a free end. The second return springs 4h are sandwiched between the clutch seat 4a and the locking member 4g and can push the free end of the locking member 4g to swing so as to engage or disengage with the clutch member 4d. The locking lever 4c is located on the side that can push the locking member 4g to swing against the spring force. A trigger spring 4e is sleeved on the locking rod 4c, and a stop plate is fixed on the locking rod 4c. The trigger spring 4e is sandwiched between the clutch seat 4a and the stop plate.

[0038] The clutch 4d is a circular cylinder, with its top hinged to the upper end of the unlocking lever 4b. The other end has a locking part that matches the upper limit groove 2a1. Two guide holes are provided on the clutch seat 4a, and the clutch 4d is located in the guide holes. The clutch 4d is constrained by the wall of the guide holes. When the clutch 4d moves in the guide holes, it can be locked into or out of the upper limit groove 2a1.

[0039] The middle part of the unlocking lever 4b is movably hinged to the clutch seat 4a by a pin. The unlocking lever 4b can swing in the up and down direction. The upper end of the unlocking lever 4b is movably hinged to the top of the clutch 4d by a pin. The lower end of the unlocking lever 4b has a protruding post extending inward. The first return spring 4f is sleeved on the protruding post. The first return spring 4f provides tension to the lower end of the unlocking lever 4b, which pushes the lower end of the unlocking lever 4b to rotate outward, while the upper end of the unlocking lever 4b rotates inward.

[0040] The latching member 4g is hinged to the clutch seat 4a via a pin. The latching member 4g swings around the pin. A spring mounting post is located on the outer side of the latching member 4g. One end of the second return spring 4h is sleeved on this spring mounting post. A corresponding spring mounting post is also provided on the clutch seat 4a, and the other end of the second return spring 4h is sleeved on this spring mounting post. The second return spring 4h provides the latching member 4g with the power to swing to the lower part of the clutch member 4d and engage it. When the clutch member 4d exits the upper limit groove 2a1 under the action of the unlocking lever 4b, the latching member 4g swings under the spring force and extends into the notch of the clutch member 4d, locking it and preventing it from moving. When the clutch member 4d disengages from the upper limit groove 2a1, the corresponding pin stops moving and is locked in the support frame 3 by the locking and unlocking device 13.

[0041] The locking lever 4c is located on the other side of the latching member 4g opposite to the second return spring 4h. When the locking lever 4c moves upward and presses against the latching member 4g, the latching member 4g overcomes the spring force and swings upward to disengage from the notch of the clutch member 4d. Under the action of the first return spring 4f, the clutch member 4d quickly resets and extends into the upper limit groove 2a1, engaging with the needle rod 2 again. When the clutch member 4d is engaged in the upper limit groove 2a1, it simultaneously presses against the seesaw 13a, causing its other end to tilt upward and push the locking member 13b of the locking and unlocking device 13 out of the lower limit groove 2a2, thereby freeing the needle rod 2 again, which then moves up and down within the support frame 3. After the lower end of the locking lever 4c is released, it triggers the spring 4e, causing the locking lever 4c to quickly reset downward and prepare for the next action.

[0042] The working principle of the needle bar clutch reset device of this double-needle sewing machine is explained below:

[0043] The double-stroke cylinder 7 of the needle bar clutch reset device of this double-needle sewing machine, under the control of the solenoid valve 12, can drive the trigger push rod 8 to sequentially achieve three positions of stopping and reset (the solenoid valve 12 is used to control the air intake and exhaust of the double-stroke cylinder 7; the double-stroke cylinder 7 is an existing structure and will not be described in detail here, but can be referred to Chinese patent document CN202122500073.5, "A Double-Stroke Cylinder"). The first position is where the unlocking lever 4b near the double-stroke cylinder 7 is vertically opposite to the protrusion 8a (refer to...). Figure 3 and Figure 4 The second position is where the locking lever 4c is vertically aligned with the protrusion 8a (refer to...). Figure 5 and Figure 6 The third position is where the unlocking lever 4b, which is away from the double-stroke cylinder 7, is vertically aligned with the protrusion 8a (see reference). Figure 7 and Figure 8The locking and unlocking device 13 of the needle bar clutch reset device of this double-needle sewing machine can be used to lock the needle bar 2 onto the support frame 3. When the needle bar 2 is in the unlocked state with the clutch assembly 4, the locking and unlocking device 13 can lock the needle bar 2, which is separated from the clutch assembly 4, onto the support frame 3. When the needle bar 2 is in the locked state with the clutch assembly 4, the locking and unlocking device 13 separates from the needle bar 2, allowing the needle bar 2 to move synchronously with the clutch assembly 4. (The needle bar 2 is provided with a seesaw 13a that triggers the locking and unlocking device 13 to separate from the needle bar 2. The clutch assembly 4, the locking and unlocking device 13, and the seesaw 13a are all existing structures and can be referred to.) Figure 9 Alternatively, one can refer to the Chinese patent document CN201920065549.7, "A Single / Double Needle Conversion Mechanism for a Double-Needle Sewing Machine," cited in the background section.

[0044] Unlike existing technologies, the clutch assembly 4 of the needle bar clutch reset device of this double-needle sewing machine is connected to the main shaft 1 via a swing arm 6 and an eccentric wheel 5. The main shaft 1 of the double-needle sewing machine drives the clutch assembly 4 to move vertically up and down. Simultaneously, a double-stroke cylinder 7 and a trigger push rod 8 driven horizontally by the double-stroke cylinder 7 are installed on the support frame 3. When the trigger push rod 8 reaches the first position, the clutch assembly 4 moves downward, causing the unlocking lever 4b near the double-stroke cylinder 7 to strike the protrusion 8a on the trigger push rod 8, thereby retracting the needle bar 2 near the double-stroke cylinder 7. When the clutch assembly 4 is unlocked (i.e., upon impact, the protrusion 8a pushes the lower end of the unlocking lever 4b near the double-stroke cylinder 7 to rotate inward, while the upper end of the unlocking lever 4b rotates outward and drives the clutch 4d hinged thereto to move synchronously, and the clutch 4d moves horizontally along the guide hole and exits the upper limit slot 2a1 on the corresponding needle bar 2), and under the action of the locking and unlocking device 13, the needle bar 2 is locked on the support frame 3, while the needle bar 2 away from the double-stroke cylinder 7 continues to remain locked with the clutch assembly 4 and moves up and down with the clutch assembly 4;

[0045] When the trigger push rod 8 moves horizontally to the second position, the clutch assembly 4 moves downward, causing the locking rod 4c on it to strike the protrusion 8a on the trigger push rod 8, thereby locking the two needle bars 2 of the double-needle sewing machine simultaneously with the clutch assembly 4. (Upon impact, the protrusion 8a pushes the locking rod 4c upward and simultaneously presses against the two locking pieces 4g, causing the two locking pieces 4g to swing upward against the spring force of the two second return springs 4h to disengage from the notches of the corresponding sewing clutch pieces 4d. The two clutch pieces 4d are respectively at the corresponding...) Under the action of the first reset spring 4f, the needle rods quickly reset and extend into the upper limit groove 2a1 of the corresponding needle rod 2, and re-engage with the needle rod 2. Under the action of the locking and unlocking device 13, both needle rods 2 separate from the support frame 3 (when the clutch 4d is inserted into the upper limit groove 2a1, it simultaneously presses the seesaw 13a so that its other end tilts up and pushes the locking member 13b of the locking and unlocking device 13 out of the lower limit groove 2a2, thereby making the needle rod 2 free again). The two needle rods 2 move up and down with the clutch assembly 4 at the same time.

[0046] When the trigger push rod 8 moves horizontally to the third position, the clutch assembly 4 moves downward, causing the unlocking lever 4b, which is away from the double-stroke cylinder 7, to strike the protrusion 8a on the trigger push rod 8. This unlocks the needle bar 2, which is away from the double-stroke cylinder 7, from the clutch assembly 4 (i.e., upon impact, the protrusion 8a pushes the lower end of the unlocking lever 4b, which is away from the double-stroke cylinder 7, to rotate inward, while the upper end of the unlocking lever 4b rotates outward and drives the clutch member 4d, which is hinged to it, to move synchronously. The clutch member 4d moves horizontally along the guide hole and exits the upper limit slot 2a1 on the corresponding needle bar 2). Under the action of the locking and unlocking device 13, the needle bar 2 is locked on the support frame 3, while the needle bar 2, which is close to the double-stroke cylinder 7, remains locked to the clutch assembly 4 and moves up and down with the clutch assembly 4. The needle bar clutch reset device of this double-needle sewing machine has a simple structure, greatly reduces the linkage transmission, and thus improves the reliability of the needle bar clutch reset device.

[0047] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A needle bar clutch reset device of a double needle sewing machine, the double needle sewing machine comprising a main shaft (1) and two needle bars (2), the needle bar clutch reset device comprising a support frame (3) through which the needle bars (2) are arranged and a locking and unlocking device (13) arranged on the support frame (3) and used for locking or unlocking the needle bars (2), and a clutch assembly (4) arranged on the two needle bars (2) simultaneously, the clutch assembly (4) comprising a clutch seat (4a) and two unlocking levers (4b) arranged on the clutch seat (4a) and used for unlocking the needle bars (2) respectively and a locking lever (4c) arranged on the clutch seat (4a) and used for locking the two needle bars (2) simultaneously, characterized in that, The eccentric wheel (5) is sleeved on the main shaft (1), the eccentric wheel (5) is connected with the clutch seat (4a) through the swing rod (6), the double-throw air cylinder (7) is fixedly connected on the support frame (3), the output shaft (7a) of the double-throw air cylinder (7) is horizontally arranged and connected with the trigger push rod (8), the trigger push rod (8) has the upwardly arranged protruding portion (8a), the protruding portion (8a) is located below the unlocking lever (4b) and the locking lever (4c), and the protruding portion (8a), the unlocking lever (4b) and the locking lever (4c) are located on the same vertical plane.

2. A needle bar clutch reset device for a twin needle sewing machine according to claim 1, wherein The support frame (3) has the stepped portion (3a) and the cover plate (9) is fixedly arranged, the moving guide groove (10) is formed between the cover plate (9) and the stepped portion (3a), the trigger push rod (8) is located in the moving guide groove (10) and abuts against the stepped portion (3a).

3. The needle bar clutch reset device for a twin needle sewing machine according to claim 1, wherein The end of the trigger push rod (8) has the U-shaped portion (8b), the L-shaped connecting block (11) is connected with the output shaft (7a) of the double-throw air cylinder (7), the connecting block (11) has the connecting hole (11a), the U-shaped portion (8b) of the trigger push rod (8) passes through the connecting hole (11a) and is clamped with the connecting block (11).

4. The needle bar clutch reset device for a twin needle sewing machine according to claim 1, wherein The side of the clutch seat (4a) has the long strip-shaped connecting portion (4a1), and the upper end of the swing rod (6) is sleeved on the connecting portion (4a1).

5. A needle bar clutch reset device for a twin needle sewing machine according to claim 1 or 2 or 3 or 4 wherein, The solenoid valve (12) is further fixedly arranged on the support frame (3) and connected with the double-throw air cylinder (7).

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